a2zinterviews

21.	How many three-digit numbers are divisible by 6 in all?
	A.  149
	B.  150
	C.  151
	D.  166

Solution

Required numbers are 102,018,114,....996. This is an A.P with a = 102, d= 6. Let the number of its terms be n. Then a+(n - 1)d ‹=›102+(n - 1)×6 = 996 ‹=›n=150.

22.	If A and b are both odd numbers which of the following is an even number?
	A.  a+b
	B.  a+b+1
	C.  ab
	D.  ab+2

Solution

Sum of two odd numbers is always even.

23.	Which of the following is always odd?
	A.  Sum of two odd numbers
	B.  Diff. of two odd numbers
	C.  Prod. of two odd numbers
	D.  none of these

Solution

Product of two numbers is always odd.

24.	325325 is a six digit number.It is divisible by
	A.  7 only
	B.  11 only
	C.  13 only
	D.  all 7,11,and 13

Solution

Clearly,325325 is divisible by all 7,11,and 13.

25.	The largest natural number which exactly divides the product of any four consecutive natural numbers is
	A.   6
	B.  12
	C.  24
	D.  120

Solution

Required numbers = 1×2×3×4 ‹=›24.